Journal
ACS CATALYSIS
Volume 11, Issue 24, Pages 14926-14931Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.1c04581
Keywords
glycerol electro-oxidation; gold; nanostructured catalyst; glycolic acid; facet-dependent OH adsorption
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Funding
- National Research Foundation of Korea (NRF) - Korean Government (MSIT) [2020M3H4A1A02084595]
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Nanostructured Au catalysts were fabricated by reducing anodic-treated Au films, leading to enhanced glycerol conversion to glycolic acid. Surface treatment and increased active sites contributed to improved reaction performance.
The glycerol electro-oxidation reaction (GEOR) can economically convert glycerol, a byproduct of biodiesel production, to glycolic acid. Herein, nanostructured Au catalysts were fabricated on a Si substrate by the electrochemical reduction of anodic-treated (RA-treatment) Au films, which tuned the surface area from 1 to 16 cm(2). Treatment of 0.1 M glycerol at 1.0 V (vs RHE) for 2 h in 1 M KOH solution afforded a glycerol conversion and glycolic acid selectivity of 50.9 and 47%, respectively. The RA-Au catalyst selectively afforded glycolic acid from glycerol due to the enhanced facet-dependent OH adsorption, especially at the (100) and (110) sites, as well as the increased surface area. RA treatment of a Au-coated Ni foam further enhanced the GEOR performance, affording 68.7% glycerol conversion and 41.2% glycolic acid selectivity at 1.0 V (vs RHE) within 2 h by providing more active sites.
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